Aquarium filter



FIG. 1 is a side view of the aquarium filter showing my new design. The opposite side being a mirror image of the side shown in FIG. 1.

FIG. 2 is a top view of the aquarium filter showing my new design.

FIG. 3 is the end view of the aquarium filter showing my new design; and,

FIG. 4 is an isometric view of the aquarium filter showing my new design.

The hoses in FIGS. 1 and 3 are shown broken away to indicate indeterminate length. 

I claim the ornamental design for an aquarium filter, as shown and described. 